"I will be glad when we get clear of the island to-morrow," said Dave, as Bob turned in for the night.
It had been a busy, exciting day, and Dave was glad to have a few moments to himself to think over affairs in general.
He stretched himself on a heap of canvas in the shadow of the rear cabin, overlooking the creek and the beautiful moonlit expanse stretching out beyond it.
Dave mused, dozed, woke up, and stretched himself. He heard the night-watch laughing and talking in low tones amidships.
"I'll join them, listen to one or two of their wild yarns, and then turn in for the night myself," he decided.
Half-arising, however, Dave came to a rigid pose. He stared hard beyond the rail and down into the still waters of the creek.
Everything was so calm and still that the least sound or movement was vividly distinct to ear and eye.
Dave's eye had detected a ripple in the quiet waters. Then momentarily a human head had protruded into view.
It bobbed down under water again. It came up ten feet nearer to the Swallow. It disappeared once more, and this seemed to carry it past the watcher's direct range of vision.
"Someone, and up to something," declared Dave to himself. "Hark, now."